Quote:
Originally Posted by J. Falcon
Working out hard without proper oxygen is very dangerous. You can black out for sure.
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You'd have to be in really poor shape for that to happen. I've used oxygen restricted masks when training for triathlons at higher elevations. Top athletes will restrict their oxygen while training at levels far worse than the normal covid mask.
https://www.amazon.com/s?k=oxygen+re...s_ts-do-p_1_17